import hmac
import json
import os
import random
import socket
import time

import requests

node = socket.gethostbyaddr(socket.gethostname())[0]

def record_observations(observations):
    for dir in (".", os.environ["HOME"] + "/.config/ltsdb", "/etc/ltsdb"):
        try:
            with open(dir + "/config.json") as fh:
                client_config = json.load(fh)
            baseurl = client_config["server"]
            break
        except FileNotFoundError:
            pass
    while True:
        for obs in observations:
            timestamp = time.time()
            msg = (node + " " + str(timestamp)).encode("UTF-8")
            digest = hmac.new(client_config["key"].encode("UTF-8"), msg, "SHA256").hexdigest()
            obs["auth"] = {
                "node": node,
                "timestamp": timestamp,
                "hmac": digest,
            }
        r = requests.post(baseurl + "record", json=observations)
        print(r)
        if r.status_code == 200:
            return True
        elif r.status_code == 409:
            time.sleep(0.5 + random.random())
            continue
        else:
            return False